package io;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class CopyDemo2 {
    public static void main(String[] args) throws IOException {
        FileInputStream fis = new FileInputStream("Fj.jpg");
        FileOutputStream fos = new FileOutputStream("Fj_.jpg");

        long start = System.currentTimeMillis();
        byte[] data = new byte[1024 * 10];//10kb
        int len;//记录每次实际读取的字节数
        while ((len = fis.read(data)) != -1) {//每次读取10kb并判断是否读取到了末尾
            //将字节数组byte从下标0开始连续len个字节写出(做到读多少就写多少)
            fos.write(data, 0, len);
        }
        long end = System.currentTimeMillis();
        System.out.println("复制完毕！耗时：" + (end - start) + "ms");




        /*
        long start=System.currentTimeMillis();
        byte[]data=new byte[1024*10];//10kb
        while (fis.read(data)!=-1){//每次读取10kb并判断是否读取到了末尾
            fos.write(data);
        }
        long end=System.currentTimeMillis();
        System.out.println("复制完毕！耗时："+(end-start)+"ms");

        fis.close();
        fos.close();

         */
    }


}
